#include <stdio.h>

void main ()
 {
   printf("0 | 0 is %d\n", 0 | 0);
   printf("0 | 1 is %d\n", 0 | 1);
   printf("1 | 1 is %d\n", 1 | 1);
   printf("1 | 2 is %d\n", 1 | 2);
   printf("128 | 127 is %d\n", 128 | 127);
 }
里面的“|“是什么运算符啊？

谢谢